Provable

Provable Markets is a New York and Amsterdam based financial technology firm operating Aurora, the first new SEC-registered Alternative Trading System (ATS) for securities finance in over a decade. Through Aurora Marketplace and Aurora Trade Manager, Provable delivers front-, middle-, and back-office technology for the securities lending market: automated trade matching, contract lifecycle management (returns, recalls, marks, rate changes), and CCP connectivity via NSCC. Its cloud-native platform exposes open APIs — a Connect/gRPC Aurora API, FIX specifications, and WebSocket/webhook event streams — and it is a FINRA member registered as an SEC ATS with SOC 2 and ISO 27001 certifications.

Provable publishes 1 API on the APIs.io network. Tagged areas include Company, Securities Lending, Capital Markets, Fintech, and Trading.

The Provable catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Provable’s developer surface includes documentation, API reference, support, engineering blog, authentication, changelog, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.6/100 thin ▬ flat Agent 36/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
1 APIs 1 MCP Servers
CompanySecurities LendingCapital MarketsFintechTradingAlternative Trading SystemPost-TradegRPCFIX

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 39.6/100 · thin
Contract Quality 5.7 / 25
Developer Ergonomics 11.3 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 3.1 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 36/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/provable: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Aurora API

The Aurora Connect (Buf) API for the SEC-registered securities-finance ATS — authentication, company/instrument reference, order management (OMS), venue order book, contract req...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

provable-mcp.yml

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Provable Events Webhooks

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Provable Authentication

apiKey/http · 2 schemes

SECURITY

Provable Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Webhooks
Webhooks
 Conformance
Conformance
 Lifecycle
Lifecycle
 DataModel
DataModel

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Compliance
Compliance
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: provable
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/provable.png
name: Provable
description: 'Provable Markets is a New York and Amsterdam based financial technology firm operating Aurora, the first new
  SEC-registered Alternative Trading System (ATS) for securities finance in over a decade. Through Aurora Marketplace and
  Aurora Trade Manager, Provable delivers front-, middle-, and back-office technology for the securities lending market: automated
  trade matching, contract lifecycle management (returns, recalls, marks, rate changes), and CCP connectivity via NSCC. Its
  cloud-native platform exposes open APIs — a Connect/gRPC Aurora API, FIX specifications, and WebSocket/webhook event streams
  — and it is a FINRA member registered as an SEC ATS with SOC 2 and ISO 27001 certifications.'
url: https://raw.githubusercontent.com/api-evangelist/provable/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- anthemis
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Securities Lending
- Capital Markets
- Fintech
- Trading
- Alternative Trading System
- Post-Trade
- gRPC
- FIX
apis:
- name: Aurora API
  description: The Aurora Connect (Buf) API for the SEC-registered securities-finance ATS — authentication, company/instrument
    reference, order management (OMS), venue order book, contract requests, contract lifecycle (returns/recalls), executions,
    agreements, and server-initiated event streams over gRPC, gRPC-Web, and Connect-HTTP.
  humanURL: https://developer.provablemarkets.com
  baseURL: https://provablemarkets.com/api/1
  properties:
  - type: Documentation
    url: https://developer.provablemarkets.com/workflows
  - type: APIReference
    url: https://developer.provablemarkets.com/api/connectapi
  - type: GettingStarted
    url: https://developer.provablemarkets.com/workflows
common:
- type: DomainSecurity
  url: security/provable-domain-security.yml
- type: DeveloperPortal
  url: https://developer.provablemarkets.com
- type: Documentation
  url: https://developer.provablemarkets.com/workflows
- type: APIReference
  url: https://developer.provablemarkets.com/api/connectapi
- type: Support
  url: https://provablemarkets.com/contact
- type: Blog
  url: https://provablemarkets.com/news-insights
- type: TermsOfService
  url: https://provablemarkets.com/terms-conditions
- type: PrivacyPolicy
  url: https://provablemarkets.com/privacy-policy
- type: Compliance
  url: https://provablemarkets.com/
- type: LLMsTxt
  url: llms/provable-llms.txt
- type: WellKnown
  url: well-known/provable-well-known.yml
- type: Authentication
  url: authentication/provable-authentication.yml
- type: Conventions
  url: conventions/provable-conventions.yml
- type: Webhooks
  url: asyncapi/provable-events-webhooks.yml
- type: MCPServer
  url: mcp/provable-mcp.yml
- type: Conformance
  url: conformance/provable-conformance.yml
- type: Lifecycle
  url: lifecycle/provable-lifecycle.yml
- type: ChangeLog
  url: changelog/provable-changelog.yml
- type: DataModel
  url: data-model/provable-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 15
  pass: local-v1